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The species which by definition has zero...

The species which by definition has zero standard molar enthalpy of formation at `298K` is

A

`Br_(2)(g)`

B

`CI_(2)(g)`

C

`H_(2)O(g)`

D

`CH_(4)(g)`

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This is possible only for elements, chlorine is a gas at this temperature, but bromines is a liquid, so it is possible only for chlorine .
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